Automatic calling device



April 7, 1925. 1,532,675

J. G. BLESSING AUTOMATIC CALLING DEVICE Filed Jan. 14, 1921 k ll M51151 John 11515551213 Patented Apr. 7, 1925.

; uNrrEn sra'rns 1,532,675 PATENT orrics.

JOHN G. BLESSING, OF CHICAGO, ILLINOIS, ASSIGNOR TO AUTOMATIC ELECTRIC COM- PANY,'OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

AUTOMATIC CALLING DEVICE.

Application filed January 14, 1921. Serial No. 437,283.

[ all whom it may concern.

Be it known that I, JOHN G. Brnssme, a citlzen of the United States of America,

and a resident of Chicago, Cook County,

and State of Illinois, have invented. certain new and usefulImprovements in Automatic Calling Devices, of which'the following is a specification.

My invention relates, in general to an automatic calling device and more specificallyto animproved type of impulse transmitter for use in an automatic telephone system of the standard two wiretype in which the automatic switches are operated by impulses of current resultant upon the opening and closing of the series linecircuit-at the telephone. This calling device may of course be used for various other purposes without departing from the spirit of my in vention.

Among the features and objects of my in vention are, to provide an improved governor and brake for regulating the speed of the dial on its return movement and for preventing a subscrlber from forcing or speeding up the dial; to provide an improved device for stopping both the dial and the governor and for operating the shunt springs and to provide various other detailed features of improvement which tend to simplify the construction and to improve the operation and general efficiency of the device in a manner which will be hereinafter pointed out. 1

Fig. l of the drawings shows a front view of the calling device with the cap covering the clock spring, removed.

Fig. 2 shows a side view taken from the right of Figure 1. 7

Figure 3 shows a back view of the device showing the governing device and the cam and springs controlled by the dial. 7

Figure l shows a rear viewof the finger hole dial showing the gear andratcl'iet device attached thereto.

Figure shows a front view of the device with the finger hole dial and number plate removed to show the various cooperating gears and otheroperating elements.-

Figure 6 shows a detailed view of the governing device. v

Figure 7 shows a side viewof the governor taken from the right of Figure 6.

Figure .8 shows the cap which fit Over .rious elements.

the spring cup on the face of the finger hole dial.

Figure 9 shows a detail of the gear 21.

I will now describe the various parts of the calling device more in detail and explain the operation of the same, reference being had to the variousfigures of the ,draw- My improved calling device consists of a mounting plate 2 having recessed openings at its front and rear to receive the va- On thefront of the plate 2 is a stud 3 (Figure 5) I and a projecti 'ig ring 4 around the circumference for protecting the linger hole. dial 5 which fastened by means of a screw 6 and lies just inside and flush with the ring. 4. A spring cup 7 issecurely fastened to the dial and encloses aaclock spring 8 one end of which is fastened ina slot in the cup 7 and the other end is slotted and hooked over a projection on one side of the screw (3. The

spring 8 normally tends to turn the dial in a counter clockwise direction, the dial being held from rotation further than normal by a screw 9 which projects through the dial and meets a part 10 (Fig. A finger stop 11 is secured to the under side of the plate 2 and projects over the finger dial.

Referring now to Figure 3 it will be seen that the rear of the plate 2 has av raised shoulder 12 which is circular in form but ,the'outer'edge of which isin the form of a circle the center of'which is offset from the center of the circle formingthe outer edge of the plate2. The circle forming th in ner edge of the shoulder 12 is concentric with the outeredge of the plate 2 so that the shoulder 12 isthicker on one side-than on the other, forming va ,monnting space for the shunt springs 24- and 25 and the interrupter springs 43 (see Fig. 3) and thus also making the distance from the outer edge of the plate 2 greater on one side than i on the other. This permits the dial to be mounted in the cup on the telephone base in such a manner as to permit the dial to be mounted nearer horizontal.

Loosely mounted on a rigid shaft. 13 is.

a. governing device (see Figures 6 and 7) which consists of a worm gear wheel 14, a thin'strip of metal 15 on which is mounted any suitable braking material 16, another strip of spring material which has been formed out into two spring arms 17 to which are attached weights at and on which is mounted some suitable braking material 18.

The a ve de c ibed parts ar moun ed on a p of the 1 wh ch has be n threaded, and are held there securely by the nut 19. The governor complete (Figs. 6 and 7) is retained on the shaft 13 by a small spring key 20 which fits into a groove in the shaft 13 (Fig. 2).

Firmly attached to the plate 2 is spring 27 (Fig. 5) which is cut in a U shape at its detached end so as to partly encircle the shaft 13, and so tensioned as to rest against the gear 14, to force the braking surfaces 16 away from plate 2. The worm gear 14 mesheswith the gear 21 which meshes with 23. Gear 21 is mounted on the plate 2 in the same manner as the governor assembly. Attached to gear is a shaft which extends through the plate 2 and to'which is attached the cam 30,

On the under side of the finger dial 5 (see Fig. 4i) is a hub 31 loosely mounted on which is a unit gear and ratchet wheel havin ratchet teeth 32 on the side next to the dial and gear teeth 33 underneath. A pawl 34 is secured to the under side of the dial 5 and 'is held in engagement with ratchet teeth 32 by a spring 35, so that the dial rotates in one direction the'pawl 3i slides over the teeth 32 and the ratchet and gear remain stationary, but as the dial returns it carries the ratchet and gear with it,

' When the finger dial is mounted in place on the plate 2 the gear teeth 33 engage with the gear 22, which is a part of the hub of gear 21.

In Fig. 5 is a bracket 10 which has two arms 37 and 3,8, and a bearing pin 11. This bracket is held in a groove on'a projection of plate 2 by the head of screw 40 and the bracket works freely on the bearing pin 41. Screw 39 screws into plate 2, and is used as an adjusting screw to limit the movement; of the bracket 10. Arm 37 controls U or fork shaped pin 36 which projects through the plate 2, one point of this pin 26 (see Fig. 2) comes in contact with a bushing of the shunt spring 24;. The other point 42 of this U or fork extends through the plate 2 to act as a governor stop to pre vent the possibility of more than the predetermined number of revolutions of the governor. The arm 38 engages with the screw 9 in the finger hole plate 5, and through the back tension of spring 8 the screw 9 eagages the arm 38 overcoming the tension of the shunt spring 24, thus holding the shunt springs open when the dial is normal.

' Upon starting to rotate the dial in a clockwise direction, the screw 9 will immediately disengage from arm 38 and cause the pins 42 and 26 to respond to the pressure of the shunt spring 24 and thereby take away the obstruction to the rotation of the governor and close the shunt springs. It will be seen that the dial must come back to normal before the pins are again forced through the plate to stop the governor and again open the shunt springs.

Particular attention is called to the fact that the gears 14 and 21 are so cut as to have a tendency to draw the governor downward as the dial returns to normal, however the spring 27 is so tensioned that it overcomes this downward pull upon the normal return of the dial. If, however, at-

tempt is made to force the dial, the tension of sprin 27 will be overcome and braking sur'taces 16 of the strip of metal 15 will be drawn into contact .with base of plate 2 and serve to prevent an increase in the speed of the dial.

Fig. 9 is a detailed view of the gear teeth of the gear 21. It is to be understood that the teeth of the gears 14, 21 and 23 are all cut on the bias or are worm' gears, so that the gear 21 in its rotation tends not only to rotate the gear let but also tends to move the shaft of said gear 14 endwise.

It will be seen therefore that I have provided a very etlicient type of automatic call ing device which has a number of new and novel features of improvement and having fully described the details of said improvements and the methods of operations what I consider to be new and desire to have pro' tected by Letters Patent will be pointed out in the appended claims.

that I claim as my invention is:

1. In a calling device, an impulse sender, a train of gears for operating said impulse sender, one of said gears having endwise motion and carrying frictional surfaces some of which engage duringthe normal operation of the dial to regulate the speed of the impulse sender, said gear moved endwise when the speed of the gears increases to bring the remainder of said frictional surfaces into action to act as a brake on said gears. V

2. In a calling device, a gear train, iinpulse sending mcchanism controlled thereby, one of said gears movable in two separate planes, the movement of said gear in one plane operating a governor to regulate the speed of the mechanism, andthe movement of the gear in the other plane apply ingva brake to the gear train. I

3. In a calling device, a cup, a governor mounted in said cup comprising an arm tatable in a plane parallel to the base of the cup and having a spring portion at each end thereof, bent to form arcs of a circle concentric with the wall of the cup.

4. In a calling device, having impulse springs, and a cam for interrupting said springs, a governor for regulating the speed of said cam, said governor comprising a rotatable arm having weighted springs on each end thereof carrying frictional surfaces, said arm and said cam rotatable in parallel planes.

5. In a calling device, a governor consisting of a rotatable arm having each end bent at right angles thereto, to form springs which flex outward when said arm is rotated, weights on the freerends of said springs to aid in flexing said springs, and a frictional surface surrounding said governor and engaged by said weights when the arm is rotated.

6. In a calling device, a governor consisting of a rotatable arm having each end bent at right angles thereto, to form springs which flex outward when said arm is rotated, weights on the free ends of said springs to aid in flexing said springs, and a frictional surface surrounding said governor and engaged by said weights when the arm is rotated, said springs bent in a circular shape being at all points equi distant from the axis of said arm.

7. In a speed governor, a shaft, a rotatable frictional surface movable parallel to said shaft, and a second rotatable frictional surface movable radially with respect to said shaft.

8. In a speed governor, ashaft, a rotatable element supported on said shaft, said element carrying two fictional surfaces, fixed frictional surfaces adapted to be engaged by said rotating surfaces, flexible supporting means for one rotating surface permitting the same to engage its fixed surface by movement away from said shaft, and means for moving said element parallel to said shaft to cause the other rotating surface to engage its fixed surface. s p

9. In a speed governor, a shaft, a rotatable element supported on said shaft, said element carrying two frictional surfaces, fixed frictional surfaces adapted to be engaged by said rotating surfaces, means for applying power to rotate said element, flexible supporting means for one rotating surface permitting the same to engage its fixed surface by movement away from the shaft responsive to centrifugal force, and means responsive to a sudden application of power for moving said element parallel to said shaft to cause the other rotating surface to engage its fixed surface.

10. In a speed governor, a frictional element, a spiral gear attached to said element for driving the same, a fixed frictional element normally disengaged from the driven element, and supporting means for said driven element adapted to permit lengthwise slipping of the gear to bring said elements into engagement. a

11. In a speed governor, a frictional element, meansincluding a spiral gear attached to said element for supplying power to rotate the same, a fixed frictional element normally disengaged from the driven element,

means for retarding the acceleration of said in operation, driving and supporting means for said member permitting displacement thereof due to the retardation produced by said elements, and two additional friction elements brought into engagement by the displacement of said member.

'13. In a speed governor, a fixed shaft, a frictional element rotatable on said shaft and movable longitudinally thereon responsive to acceleration beyond a predetermined v speed, and a second frictional element engaged by said rotatable element when the latter is moved longitudinally on said shaft as set forth.

14. In a speed governor, a frictional element and means for rotating it, supporting means for said element permitting displacement thereof in a direction parallel to its axis of rotation responsive to a predetermined acceleration, and a second frictional element engaged by said firs-t element when the same is displaced.

15. In a speed governor, a rigid frictional element, means for driving said element, a fixed frictional element normally disengaged from the driven element, and means responsive to'the acceleration of the driven element beyond a predetermined speed for bodily displacing the same to bring about its engagement with said fixed element.

16. In a speed governor, a frictional element, a shaft, means for rotating said element on said shaft, a fixed frictional element normally disengaged from the rotating elcment, and means responsive to the accelera tion of said rotating elentient beyond a predetermined speed for displacing the same in a direction parallel to said shaft to cause the rotating element to engage the fixed element.

Signed by me at Chicago, Illinois, this 7th day of January, 1921.

JOHN G. BLESSING. 

